《Table 2 Triterpenoids of Gynostemma》

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《Research Progress of Triterpenoid Secondary Metabolites in Cucurbitaceae Plants》

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There are about 30 species in Hemsleya，and this genus has a variety of tubers for medicinal purposes，which are used as raw materials for extracting hemsleyadin or as a raw medicinal material[1].Hemsleya is rich in triterpenoids，mainly cucurbitane type tetracyclic triterpenoids and their glycosides and oleanane type pentacyclic triterpenoids and their glycosides.At present，researchers at home and abroad have isolated more than 80 cucurbitane type triterpenoids from this genus.Glycosides are often connected to 1-3 glucoses，the collecting positions of which are mostly at C-2 and C-3 positions and the 26 and 27 positions of the side chain，and partial structures are shown in Fig.3 and Table1.The nucleus of this genus is mainly tetracyclic triterpenoid，and the structural features are that the C-2 and C-3 positions are glycosidated or substituted by hydroxy，the C-11 position has hydroxyl or carbonyl，the C-23 and 24 positions of the side chain often have double bonds，and the 25 position has hydroxyl or acetyl group.The other major class of triterpenoids in Hemsleya is oleanane type compounds，about 30 kinds，and the nucleus structure is shown as T-18.The differences between these compounds are mainly that the substituents at the C-3 and C-28 positions are different，the 3position contains a glycosyl group，and the 28 position is mainly connected via a carboxyl group on the aglycone to glucose or glucuronic acid，arabinose and mannose rarely，such as 3-O-（6'-butyl ester-）-β-D-glu-curonopyranosyl) -oleanolic acid-28-O-ɑ-L-arabinopyranoside，Hemslonin B and 3-O-β-D-glucuropyranosyl oleanolic acid-28-O-β-Dmanupyranoside[16，29].